/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | foam-extend: Open Source CFD
   \\    /   O peration     | Version:     4.1
    \\  /    A nd           | Web:         http://www.foam-extend.org
     \\/     M anipulation  | For copyright notice see file Copyright
-------------------------------------------------------------------------------
License
    This file is part of foam-extend.

    foam-extend is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by the
    Free Software Foundation, either version 3 of the License, or (at your
    option) any later version.

    foam-extend is distributed in the hope that it will be useful, but
    WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with foam-extend.  If not, see <http://www.gnu.org/licenses/>.

\*---------------------------------------------------------------------------*/

#include "W2RBFFunction.H"
#include "addToRunTimeSelectionTable.H"

// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

namespace Foam
{
namespace RBFFunctions
{
    defineTypeNameAndDebug(W2, 0);
    addToRunTimeSelectionTable(RBFFunction, W2, dictionary);
}
}


// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

Foam::RBFFunctions::W2::W2(const scalar radius)
:
    RBFFunction(),
    radius_(radius)
{}


Foam::RBFFunctions::W2::W2(const dictionary& dict)
:
    RBFFunction(),
    radius_(readScalar(dict.lookup("radius")))
{}


// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //

Foam::RBFFunctions::W2::~W2()
{}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

Foam::scalar Foam::RBFFunctions::W2::evaluate(const scalar dist) const
{
    return
        neg(dist - radius_)
       *Foam::max
        (
            pow4(1.0 - (dist/radius_)),
            0.0
        )*(1.0 + 4.0*(dist/radius_));
}

// ************************************************************************* //
